camilla.compton@LIGO.ORG - posted 13:35, Tuesday 20 June 2023 - last comment - 14:19, Tuesday 20 June 2023(70616)
TCS changes required for 60W stable IFO configuration
As Elenna states in alog 70497, changing TCS settings for the IFO to be stable at 60W should only be a reduction of ETM ring heaters down to 1.0W/segment.
We've not historically had locking issues while changing the ETM ring heaters. I expect the bulk of the heating change should happen in the first ~3-4 hours (65113) and then we'll have a slow transient as the TM cools over the following 24 hours. Suggest a 4am ring heater reduction will leave us in a mostly steady state by 8am .
We will want to watch the violins while this change is happening as ring heater changes do effect the violin damping settings, alog 67176. Tagging SUS.
|
Power In
|
Ring Heater /segment |
CO2X
@25W |
CO2Y
@25W |
Notes
|
|||
|
IX
|
IY
|
EX
|
EY
|
||||
| 75W Current 70078 |
0.44
|
0.0
|
1.2
|
1.2
|
1.7
|
1.7
|
Start of O4 settings
|
| 60W Old Stable 68491 |
0.44
|
0.0
|
1.0
|
1.0
|
1.7
|
1.7
|
Used @60W from 2023/03/3 |
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